<template>
    <li>
      <label>
        <input type="checkbox" :checked="todo.done" @change="handleCheck(todo.id)" />
        <!-- 如下代码也能实现功能,但是不太推荐,因为违反了不能修改props的原则 -->
        <!-- <input type="checkbox" v-model="something" /> -->

        <span v-show="!todo.isEdit">{{todo.title }}</span>
        <input
          type="text"
          v-show="todo.isEdit"
          :value="todo.title"
          @blur="handleBlur(todo,$event)"
          ref="inputTitle"
        />
      </label>

      <button class="btn btn-danger" @click="handleDelete(todo.id)">删除</button>
      <button v-show="!todo.isEdit" class="btn btn-edit" @click="handleEdit(todo)">编辑</button>
    </li>
</template>

<script>
import pubsub from "pubsub-js";

export default {
  name: "MyItem",
  props: ["todo"],
  methods: {
    handleCheck(id) {
      // this.checkTodo(id)
      this.$bus.$emit("checkTodo", id);
    },
    handleDelete(id) {
      if (confirm("确认删除吗?")) {
        // this.deleteTodo(id)
        // this.$bus.$emit("deleteTodo",id)
        pubsub.publish("deleteTodo", id);
      }
    },
    handleEdit(todo) {
      // todo.isEdit=true
      if (todo.hasOwnProperty("isEdit")) {
        todo.isEdit = true;
      } else {
        console.log("$set");
        this.$set(todo, "isEdit", true);
      }
      this.$nextTick(function() {
        this.$refs.inputTitle.focus();
      });
      // setTimeout(() => {
      //   this.$refs.inputTitle.focus();
      // }, 200);

      //  setTimeout(() => {
      //   this.$refs.inputTitle.focus();
      // });
    },
    //失去焦点回调
    handleBlur(todo, e) {
      todo.isEdit = false;
      console.log(e.target.value);
      if (!e.target.value.trim()) return alert("输入不能为空！");
      this.$bus.$emit("updateTodo", todo.id, e.target.value);
    }
  }
};
</script> 

<style scoped>
li {
  list-style: none;
  height: 36px;
  line-height: 36px;
  padding: 0 5px;
  border-bottom: 1x solid #ddd;
}
li label {
  float: left;
  cursor: pointer;
}

li label li input {
  vertical-align: middle;
  margin-right: 6px;
  position: relative;
  top: -1px;
}
li button {
  float: right;
  display: none;
  margin-top: 3px;
}

li:hover {
  background-color: #ddd;
}
li:hover button {
  display: block;
}
li:before {
  content: initial;
}

li:last-child {
  border-bottom: none;
}


</style>